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Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory.

Nicolás Jaramillo O1, Diana Castillo, Marta Wolff E

  • 1Instituto de Biología, Universidad de Antioquia, Medellín, Colombia. njaram@epm.net.co

Memorias Do Instituto Oswaldo Cruz
|September 10, 2002
PubMed
Summary

Morphological changes in Panstrongylus geniculatus (triatomine bug) populations were studied over five generations. Size decreased, but shape remained consistent, suggesting colonization markers may take longer to appear.

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Area of Science:

  • * Vector biology and entomology
  • * Chagas disease vector research

Background:

  • * Panstrongylus geniculatus, a Chagas disease vector, is increasingly found in human dwellings in Colombia.
  • * Understanding morphological changes during synanthropic adaptation is crucial for surveillance.

Purpose of the Study:

  • * To analyze morphological differences between wild and laboratory-reared P. geniculatus populations.
  • * To assess if geometric morphometry can detect adaptation to human dwellings (synanthropy).

Main Methods:

  • * Geometric morphometry was used to analyze morphological variations.
  • * Five generations of laboratory descendants from a wild population were studied.

Main Results:

  • * Significant reductions in head and wing size were observed from wild to laboratory populations.

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  • * Head size reduction stabilized by the second generation, while wing size reduction continued up to the fifth generation.
  • * No significant change in sexual size dimorphism was detected over five generations.

    • Conclusions:

    • * Observed size changes likely stem from physiological adaptation to new environments (ecotopes).
    • * Permanent morphological markers of synanthropic adaptation in P. geniculatus may require more than five generations to manifest.
    • * Current surveillance may need to consider longer timeframes for detecting colonization markers.